A new ILD assembly timeline 2016126 Yasuhiro Sugimoto

A new ILD assembly timeline 2016/12/6 Yasuhiro Sugimoto @LCWS 2016 1

Boundary conditions • Detector assembly and commissioning should be completed in 9 years • Assembly Hall (AH) on surface becomes available in Q 3 (Aug. ) of Y 3 • Platform over vertical shaft in AH becomes available in Q 2 of Y 4 • Detector Hall (DH) underground becomes available in Q 3 (Aug. ) of Y 7 • Si. D is lowered to DH in Y 7 -Q 3 to Y 8 -Q 1 • ILD is lowered to DH in Y 8 -Q 2 to Y 8 -Q 3 after Si. D (New assumptions) • Magnet full current test should be done before barrel calorimeter installation • Solenoid outer vacuum tank (OVT) is built outside YB 0 yoke, and inserted to YB 0 as a cylinder (Richard’s plan) 2

New assumption (1) • Full-current test of detector magnet should be done before barrel CAL installation – If some problem is found in solenoid after CAL installation, we might have to uninstall CAL to repair solenoid Risk of large loss of time – To make it possible, iron yokes should be ready earlier than previous plan 3

New assumption (2) • Solenoid outer vacuum tank (OVT) is assembled independently from iron yoke – CMS design • Central part of OVT is used as a assembly tool (Ferris wheel) of central iron yoke (YB 0) • Solenoid cryostat cannot be removed from YB 0 – ILD design by Richard Stromhagen • OVT is assembled as a cylinder independently from YB 0 • Solenoid cryostat containing coil is fixed to YB 0 by bolts and nuts, and can be removed from YB 0, if necessary 4

CMS assembly 5

ILD assembly 6

A possible solution 7

Comparison with previous plan • Shorter yoke construction period • Earlier start of Muon/Endcap CAL installation • Shorter Solenoid construction period on site Previous timeline New timeline 8

Timeline for solenoid • • • OVT and coil are assembled and installed using swiveling platform successively ( CMS: OVT was assembled directly on the YB 0) IVT is assembled aside the swiveling platform, and moved to the swiveling platform for installation Period for coil assembly on-site is shortened from 30 mo to 16 mo – Starts 10 mo later due to tool preparation/test (ignored before) and OVT construction and installation – Completed 4 mo earlier to make magnet full current test possible before barrel CAL installation • The timeline is somewhat tight, but still looser (? ) than that of CMS – CMS: 5 modules, ILD: 3+4(DID) modules (? ) 9

Longer term timeline • Feasibility of the plan has to be confirmed by a manufacturer We asked Toshiba to do this together with feasibility study of DID Visit to Toshiba 10

Garage in AH • Size of the garage (alcove) of Assembly hall should be enlarged – Swiveling platform requires large space during swiveling Position of the swiveling platform is shifted – One more yoke ring exists before Coil/IVT installation YB 0 with OVT has to be stored in the garage to keep enough space for other yoke assembly and detector installation – Space for cryogenic system on surface YB 0 in garage 15 m Before 25 m After 10 m 15 m 11

Swiveling platform ~14 m ~4 m (In case of ILD) ~14 m 12

Swiveling platform 13

Swiveling platform 14

Summary • A new ILD assembly timeline has been considered under new assumptions • It seems ILD assembly in 9 years is possible • But there are still many open questions – Iron yoke rings should be assembled in ~6 months/ring • Is it feasible? • What is the size of pre-assembly hall needed for construction of iron blocks? – DID options (No DID or integrated into 3 solenoid modules is favorable from mechanical point of view) – Feasibility of DID manufacturing – Is the timeline for solenoid (+DID) construction acceptable for manufacturer? • Toshiba will study – Space and time requirements for the cryogenic system for solenoid in Assembly Hall on surface – Installation method for endcap muon detector (particularly bottom part) • Do we need a pit for installation in AH (and DH)? – Time requirement for land development in IR surface • 3 Q (assumption) or >2 years (by Tokiko Onuki) • In latter case ILD (and ILC) cannot be get ready for collision in 10 years 15